<?php
class Smtp {
	var $smtp_port;
	var $time_out;
	var $host_name;
	var $log_file;
	var $relay_host;
	var $debug;
	var $auth;
	var $user;
	var $pass;
	var $sock;
	function Smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass) {
		$this -> debug = FALSE;
		$this -> smtp_port = $smtp_port;
		$this -> relay_host = $relay_host;
		$this -> time_out = 3600;
		$this -> auth = $auth;
		$this -> user = $user;
		$this -> pass = $pass;
		$this -> host_name = "localhost";
		$this -> log_file = "";
		$this -> sock = FALSE;
	}

	function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {
		$mail_from = $this -> get_address($this -> strip_comment($from));
		$body = ereg_replace("(^|(\r\n))(\.)", "\1.\3", $body);
		$header = "MIME-Version:1.0\r\n";
		if ($mailtype == "HTML") {
			$header .= "Content-Type:text/html\r\n";
		}
		$header .= "To: " . $to . "\r\n";
		if ($cc != "") {
			$header .= "Cc: " . $cc . "\r\n";
		}
		$header .= "From: $from<" . $from . ">\r\n";
		$header .= "Subject: " . $subject . "\r\n";
		$header .= $additional_headers;
		$header .= "Date: " . date("r") . "\r\n";
		$header .= "X-Mailer:By Redhat (PHP/" . phpversion() . ")\r\n";
		list($msec, $sec) = explode(" ", microtime());
		$header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";
		$TO = explode(",", $this -> strip_comment($to));
		if ($cc != "") {
			$TO = array_merge($TO, explode(",", $this -> strip_comment($cc)));
		}
		if ($bcc != "") {
			$TO = array_merge($TO, explode(",", $this -> strip_comment($bcc)));
		}
		$sent = TRUE;
		foreach ($TO as $rcpt_to) {
			$rcpt_to = $this -> get_address($rcpt_to);
			if (!$this -> smtp_sockopen($rcpt_to)) {
				$this -> log_write("Error: Cannot send email to " . $rcpt_to . "\n");
				$sent = FALSE;
				continue;
			}
			if ($this -> smtp_send($this -> host_name, $mail_from, $rcpt_to, $header, $body)) {
				$this -> log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
			} else {
				$this -> log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");
				$sent = FALSE;
			}
			fclose($this -> sock);
			$this -> log_write("Disconnected from remote host\n");
		}
		return $sent;
	}

	function smtp_send($helo, $from, $to, $header, $body = "") {
		if (!$this -> smtp_putcmd("HELO", $helo)) {
			return $this -> smtp_error("sending HELO command");
		}
		if ($this -> auth) {
			if (!$this -> smtp_putcmd("AUTH LOGIN", base64_encode($this -> user))) {
				return $this -> smtp_error("sending HELO command");
			}
			if (!$this -> smtp_putcmd("", base64_encode($this -> pass))) {
				return $this -> smtp_error("sending HELO command");
			}
		}
		if (!$this -> smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
			return $this -> smtp_error("sending MAIL FROM command");
		}
		if (!$this -> smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
			return $this -> smtp_error("sending RCPT TO command");
		}
		if (!$this -> smtp_putcmd("DATA")) {
			return $this -> smtp_error("sending DATA command");
		}
		if (!$this -> smtp_message($header, $body)) {
			return $this -> smtp_error("sending message");
		}
		if (!$this -> smtp_eom()) {
			return $this -> smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
		}
		if (!$this -> smtp_putcmd("QUIT")) {
			return $this -> smtp_error("sending QUIT command");
		}
		return TRUE;
	}

	function smtp_sockopen($address) {
		if ($this -> relay_host == "") {
			return $this -> smtp_sockopen_mx($address);
		} else {
			return $this -> smtp_sockopen_relay();
		}
	}

	function smtp_sockopen_relay() {
		$this -> log_write("Trying to " . $this -> relay_host . ":" . $this -> smtp_port . "\n");
		$this -> sock = @fsockopen($this -> relay_host, $this -> smtp_port, $errno, $errstr, $this -> time_out);
		if (!($this -> sock && $this -> smtp_ok())) {
			$this -> log_write("Error: Cannot connenct to relay host " . $this -> relay_host . "\n");
			$this -> log_write("Error: " . $errstr . " (" . $errno . ")\n");
			return FALSE;
		}
		$this -> log_write("Connected to relay host " . $this -> relay_host . "\n");
		return TRUE;
	}

	function smtp_sockopen_mx($address) {
		$domain = ereg_replace("^.+@([^@]+)$", "\1", $address);
		if (!@getmxrr($domain, $MXHOSTS)) {
			$this -> log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");
			return FALSE;
		}
		foreach ($MXHOSTS as $host) {
			$this -> log_write("Trying to " . $host . ":" . $this -> smtp_port . "\n");
			$this -> sock = @fsockopen($host, $this -> smtp_port, $errno, $errstr, $this -> time_out);
			if (!($this -> sock && $this -> smtp_ok())) {
				$this -> log_write("Warning: Cannot connect to mx host " . $host . "\n");
				$this -> log_write("Error: " . $errstr . " (" . $errno . ")\n");
				continue;
			}
			$this -> log_write("Connected to mx host " . $host . "\n");
			return TRUE;
		}
		$this -> log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");
		return FALSE;
	}

	function smtp_message($header, $body) {
		fputs($this -> sock, $header . "\r\n" . $body);
		$this -> smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));
		return TRUE;
	}

	function smtp_eom() {
		fputs($this -> sock, "\r\n.\r\n");
		$this -> smtp_debug(". [EOM]\n");
		return $this -> smtp_ok();
	}

	function smtp_ok() {
		$response = str_replace("\r\n", "", fgets($this -> sock, 512));
		$this -> smtp_debug($response . "\n");
		if (!ereg("^[23]", $response)) {
			fputs($this -> sock, "QUIT\r\n");
			fgets($this -> sock, 512);
			$this -> log_write("Error: Remote host returned \"" . $response . "\"\n");
			return FALSE;
		}
		return TRUE;
	}

	function smtp_putcmd($cmd, $arg = "") {
		if ($arg != "") {
			if ($cmd == "")
				$cmd = $arg;
			else
				$cmd = $cmd . " " . $arg;
		}
		fputs($this -> sock, $cmd . "\r\n");
		$this -> smtp_debug("> " . $cmd . "\n");
		return $this -> smtp_ok();
	}

	function smtp_error($string) {
		$this -> log_write("Error: Error occurred while " . $string . ".\n");
		return FALSE;
	}

	function log_write($message) {
		$this -> smtp_debug($message);
		if ($this -> log_file == "") {
			return TRUE;
		}
		$message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;
		if (!@file_exists($this -> log_file) || !($fp = @fopen($this -> log_file, "a"))) {
			$this -> smtp_debug("Warning: Cannot open log file \"" . $this -> log_file . "\"\n");
			return FALSE;
			;
		}
		flock($fp, LOCK_EX);
		fputs($fp, $message);
		fclose($fp);
		return TRUE;
	}

	function strip_comment($address) {
		$comment = "\([^()]*\)";
		while (ereg($comment, $address)) {
			$address = ereg_replace($comment, "", $address);
		}
		return $address;
	}

	function get_address($address) {
		$address = ereg_replace("([ \t\r\n])+", "", $address);
		$address = ereg_replace("^.*<(.+)>.*$", "\1", $address);
		return $address;
	}

	function smtp_debug($message) {
		if ($this -> debug) {
			echo $message;
		}
	}

}
?>
